Hi G-Sun, Breeder, and all.
I may have found a problem with tempo mapping. Actually finzic came across it first.
http://forum.cockos.com/showthread.php?t=104927
This has nothing to do with you guys and your tempo mapping actions. I believe this is a problem with Reaper.
It will not process BPMs of 240 and over. It works fine with BPM-239 but from 240 on it basically cuts the BPM in half. BPM-240 becomes 120, BPM-260 becomes 130, etc..
Also instead of createing full measure tempo markers it's making them half measure tempo markers. In other words instead of going from
Bar-1/Beat-1 to Bar-2/Beat-1 it's going from
Bar-1/Beat-1 to Bar-1/Beat-3. You can see that in the pict below. The Project Settings remained the same but the Transport BPM changed which makes sense.
Heres a picture of trying to create double time with a basic 120-BPM project. In other words going from BPM-120 to 240. It just doesn't like BPM-240 and above.
This should probably be in the Bug reports but I wanted to run it by you guys first in case I'm missing something.