Hi Darrel

You are right about the .LST file. It looks approximately like this.

It is a sad problem. I certainly do not have the energy to re-install Windows 8 with all programs and settings. But I love PicBasic Pro and the little 8-bit PIC microcontrollers so I will not give up this time ...

Here is my solution to the problem, for those who may be interested:
I installed a Windows 7 x64 SP1 in VMware Player. It runs with Host-only network (a private network shared with the host). It does not download any updates to Windows. I install only PBP3, Microcode Studio Plus 5, MPLABX 2.0 and PICKit2 burning software.
And above all: I keep a working copy of the system I can use if the problem shows up there.

Now it runs fine there.

- Jacob