I have this problem my system under the PowerBook G4, when I boot or reboot the system sometimes show a white window and doesn't load the sytem fully, the log program show this:

----------------------------------------------------------------------
21:02:26 27-dic-17
68k Exception 2 <Unknown Exception>
Task 0x200a8ca8 <« Public Screen Manager »>
Dn[0] 00000010 10108e94 43300000 00000000 200b1440 24000240 200b14e0 20001948
An[0] 200b1320 200bc9f0 00000000 00000000 200b1460 200a8ca8 20001948 00000000
PC b6680000 SR 1133

Sometimes to third time the system is loaded fine others much I have several reboots, even I did a new installation and the problem again is here.
The problem is the kernel? the system?

Remove all 3rd party screenbar modules.

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is the cause related to 3rd party screenbar modules attempting to load before MorphOS has completed starting up itself? If that is the cause, perhaps starting the offending 3rd party screenbar module manually after the system boots would work, and complete removal would not be required.

Since MorphOS boots so quickly, I would actually be surprised if that was the cause.

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You might be suprised then...

P.S. That feeling when you beat Andreas to post a relevant link - priceless :)

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Thank you for your help, I renamed the drawer and now I boot the first time. Other question is the other problems with graphic drivers for this apple computer, sometimes the workbench screen appear in horizontal stripes and I have reboot the system.

Try to reduce screen brightness to zero and increase it back again if that happens.

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Thanks for your help again.