Hello and thanks everyone for your continuing feedback.
Installed 8.8.1.1 dated 25 July from download page. Current bets window correctly cancels all bets with one click. Funds periodically go to -1. No errors in the log so far.
That version was not set to log the empty response errors, so presumably there are lots of them, you just don't see them in the log.
Does the latest build (the one I posted several hours ago) still not cancels all bets in one go?
Still getting the empty response message but just one an hour and curiously it time stamps an hour into the future
The time is synchronised with BF's current time, so the fact that it jumps ahead means there's some rubbish in that field or some other problem we have not discovered yet.
I will keep working today to reproduce all the issues you have reported and hopefully kill them off one by one.