PA 21.00.18 running on Windows 7 64 bit.
I made a big .PA file and thought I’d check it was made correctly with Menu / Actions / Test.
a) PA always issues a UAC prompt to do this!
b) PA always says there are many errors in PA files.
Verified: Uninstalling PowerArchiver from the system solved the issue.
I can now burn ISO files to the DVD-RW / CD-R Disc.