@filkertom: it's a single two-track stereo file.

@all: thank y'all so much for all the suggestions and support. I have too little time during the week to even start checking it all out, but I will get at it starting Friday and get back to you ASAP.

What seems to be clear by now:
1) The problem is within my system or BiaB configuration, as the song renders properly on other machines
2) Using ASIO is unnecessary, since no recording is involved. I will try and stick to MME to not create further problems
3) I will get latest Updates/Builds from pgmusic, latest drivers from Dell for the soundcard, latest drivers for my MIDI Keyboard
4) I will try a Factory reset
5) I might try a trial version of Forte, although strictly speaking, proper rendering should be possible with CoyoteWT
6) had a phone call with the Support hotline of my local vendor, who suggested disabling Antivir Software, trying to run BiaB in Admin mode, disabling mobile network connections (apart from all the things you folks already suggested..)

Lot of testing ahead...


@jazzmandan: sorry, I didn't mean to remind you of your past troubles....:-)could've guessed from the sheer number of your posts that you must've been in trouble before. I was merely interested, because you have a Dell and Win7 system...didn't realize it's a Desktop - in that case, things aren't really comparable.

When this notebook was brandnew, I was a little annoyed by how much useless and even obtrusive software was pre-installed by Dell - making it a so-called "Multimedia Notebook":( I still have the suspicion that there is some of it left that keeps BiaB from working properly.

Does anyone know of a freeware analysis tool to diagnose and troubleshoot the system's sound and MIDI setup under Win7? I know there are such things for WinXP, but haven't heard of something for Win7. It could be a good idea for me to try and run such a tool.