I have several batch processors that are supposed to operate only on .m4a files. To realize this, I have checked the box "Filter Files:" in the batch processor window and set a (regular expression) filter ".*\.m4a$" for the filename. This used to work fine until recently. Now, I keep getting "Warning: No valid file was selected." If I switch the filter off, the batch processors work fine -- except of processing all files instead of the intended files.
Can anyone tell me what has changed?
"Filter Files" Stopped Working in Batch Processors
Moderator: Martin Hairer