What do I need to do to convince you that this is a problem?
I posted all the output, such as it is, from the failed bootload and sketch upload
if there's any information I can provide, within the limits of this apparent bug in the IDE output, just let me know.
fails when using an ATtiny85?
Also, the reason it took me 4 days to respond is because I didn't receive a notification that you replied.
Fix that bug and I'll respond as quickly as I can.