@stefcep2
Right, thanks for your help, this will come handy for sure.

@Oldsmobile_Mike
Hey Mike, I have 3.9 and did everything as suggested and after reboot i got the Amiga dos screen so something's off with that TLSFmem, at least for me it does not work? So I booted with a workbench floppy and replaced the existing startup-sequence with a backup one and now it's back to previous/working setup.. thank G for having a backup in TEMP folder.

Thanks for your help too, much appreciated.