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I certainly would like this to be a comprehensive list of problems, I can only realistically include the show stoppers. I've also only added problems that have been solidly confirmed.
If you are a user of SAP on 680x0 Macintoshes, you should NOT install Mac OS 7.6 on your 680x0 based Macintosh.
In order to ease access to more timely information, here are links to other online resources:
Please remember that not everything on the non-Apple pages is an actual problem. Rely on only the confirmed problem reports.The Mac OS 7.6 installer includes Open Transport 1.1.1 and QuickDraw 3D 1.0.6. Both of these pieces of software have been already updated to new versions from Apple. The newer versions of the software are Open Transport 1.1.2 and QuickDraw 3D 1.5 (available from Apple Software Updates). The newer versions were not included in the Mac OS 7.6 installer because they were released after the Mac OS 7.6 lineup was finalized and there was not enough time to include them for release testing.
Further omissions include Thread Manager 2.1.3 instead of 2.1.5. Version 2.1.5 is included with the MPEG plug-in for QuickTime. While AppleShare Workstation software 3.6.4 is required for network installs and is included with Mac OS 7.6, Apple has released 3.6.5ZM already. The ZM designation means that it can be installed over any localized (any country specific) version of Mac OS.
The newer versions of the software should be installed after installing Mac OS 7.6. If they are installed prior, the Mac OS 7.6 installer will complain about the newer versions.
TOPIC
Why do I have three control panels for controlling the display and sound on my PowerBook 1400 computer after installing Mac OS 7.6?DISCUSSION
IssueThe Mac OS 7.6 installer incorrectly installs two additional control panels, 'Monitors' and 'Sound' on PowerBook 1400 series computers if you choose the Easy Install option, and are installing over an existing System Folder. You only need the one control panel, 'Monitors and Sound'. You can throw the other two away. All of these control panels work, but only the one which controls both the Monitors and Sound is needed.
If you are creating a new System folder (clean install) and you choose the Easy Install option, the Mac OS 7.6 installer incorrectly installs two separate control panels: 'Sound' and 'Monitors.', NOT the one 'Monitors and Sound'.
ResolutionTo get the correct Monitors and Sound control panel, you must perform a Custom Installation in which you specifically select the desired control panel.
Tech Info Library articleTOPIC
Sometimes on the restart after installing Mac OS 7.6, or more often after resetting PRAM, the contrast of my PowerBook passive matrix display is very dark. The brightness and contrast controls do not let the screen be adjusted to a more usable level. Is there a workaround?
DISCUSSION
Here is a workaround. Restart the PowerBook; after it has fully started press and hold the power button to get the shutdown dialog, then press the "R" key to restart the computer. On startup, the display should be functioning normally, or allow adjustment if you changed the brightness and contrast settings while the display was dark.
Engineering is aware of this issue, and they are working to correct it in a future update.
Affected PowerBook computers
This issue has been duplicated on PowerBook 5300/190 computers only, but may occur on other passive matrix equipped PowerBook computers. It has not been duplicated on the PowerBook 1400cs computer.
A bug relating to the interaction between Speed Doubler versions prior to 1.3.2 and 2.0.1 and Find File has been discovered. It can lead to corruption of a disk's catalog. A more detailed description can be found on Macintouch and updaters to fix the problem can be found at Connectix's updaters page.
Apple CD-ROM 5.3.1, which comes with System 7.6, installs a driver for most CD Recorders, even for those it cannot deal with properly. Toast will warn you that there is an "unknown driver" installed, and that some features will not be available. The "Mount CD-ROM" command will not work, multisession CDs might not mount at all, audio extraction might not work, etc. However, recording should work fine. Unfortunately there is no good way to work around this, other than booting with extensions off. The next version of Apple CD-ROM will no longer cause these problems.(from Macintosh Resource Page)
There is a bug in Premiere in which editing a large file can crash the system. Adobe is aware of the problem. (from MacFixit)
There is a bug in WordPerfect which renders MacLinkPlus inoperable with that application. WordPerfect is aware of the bug and is working on an updater. (from MacFixit)
After running the Norton Disk Doctor component of Norton Utilities 3.2 - 3.2.3, the Norton Disk Doctor's report files will not be shown because they are "corrupted." The updater to NU 3.2.4 fixes the problem. There is also a Read Me that goes along with the updater.
The following 68000 and 68020 based Macintoshes cannot run Mac OS 7.6. The last version of Mac OS to support these machines is Mac OS 7.5.5 which is also available to the MIT community.
Early versions of the following machines may require a hardware fix before Mac OS 7.6 can be installed. You can download the 5xxx/6xxx Tester.
The following machines were just recently released from Apple and cannot run Mac OS 7.6. A soon to be released revision named Mac OS 7.6.1 will support these machines.
The following machine requires a special enabler in order to run Mac OS 7.6. Do not use the general Mac OS 7.6 release on this machine. Only Install from the CD-ROM provided with the machine.
Apple recently determined that a limitation in CFM-68K (Code Fragment Manager for 68K Macs) is really a nasty bug. For consequence to MIT users, SAP relies on this software being available in order to run SAP securely on 68K based Macintoshes. Mac OS 7.6 will refuse to load CFM-68K if it is present in the System Folder. Apple will release a fix for this problem in the near future.
If you are a user of SAP on a 68K based Macintosh, do not install Mac OS 7.6 at this time. Previous versions of the Mac OS are OK as long as you do not concurrently run the software listed below.
In addition, the following software should not be run on a 68K based Macintosh with CFM-68K installed as they expose the bug: OpenDoc, LaserWriter 8.4.x, Microsoft Internet Explorer, Cyberdog.
Unlike some of the software listed above, SAP does not exploit the CFM-68K bug. It is safe to use SAP with CFM-68K on Mac OS 7.5.x.
Although all PowerPC Macintoshes utilize CFM, they are not affected by the bug.
Mac OS 7.6 is only designed to work with Open Transport networking. On some machines, it may be possible to revert back to Classic AppleTalk however this can place your Macintosh into an unstable condition and is unsupported.
The PowerTalk mail system will not run under Mac OS 7.6. The Mac OS 7.6 Installer will disable any PowerTalk and PowerShare extensions it finds upon installation. Mac OS 7.5.5 is the last system that will support PowerTalk. PowerTalk's dead, Jim!
Questions or comments? Send mail to macdev@mit.edu
Last updated on $Date: 2003/11/18 21:57:26 $
Last modified by $Author: smcguire $