Returning TRUE to Abort callback causes hang

I can burn files to CD just fine, but if I return TRUE to the Abort callback during the “writing files” phase, it stops writing, sets the “lead-in and lead-out” phase message, and then does nothing - NeroBurn does not return. I have to kill the process, but this leaves the drive in an unusable state - I cannot eject the disk after this.

Note I am testing this with the NeroFiddles sample application. It displays “NeroAPI version”. Does NeroFiddles need to be updated, or is this a new bug in api version

Any help would be appreciated.