Thanks for your reply, Guga!
> I assume you pressed F6 "compile+run"
Yes
> Did you configured RosAsm as below:
Instead of 3 times F: there is 3 times C:, but the rest seems identical.
> If not, i´m posting to you my config file.
This didn't help. In fact, it made things worse. With your config.bin, I cannot even open a project then: if I select File\open, the configuration dialog opens and, after clicking ok, Rosasm terminates.
> If it is still not working tell me which OS you are using.
It's Windows XP SP3.
Btw, I found an old copy of Rosasm on my computer, version 2049, and with this version I can see the debug dialog.
Perhaps you did change something there, perhaps the dialog does use an unusual font or control?
[EDIT]
I copied the Rosasm2053b.exe binary to the "old" Rosasm directory and it also "works" now, that is, I can see the debug dialog. So my assumption that it may be some weird font or control that causes the problem is wrong. Perhaps it's a problem if the debug dialog windows is located "beyond" the screen limits? I tried to "move" the (may be invisible) dialog with the keyboard, but regrettably the keyboard interface to access the system menu via ALT-SPACE seems to be deactivated.
Anyway, I can happily live with the "old" directory and config file.