Help and Manual switch
 

VBP has an invalid switch for compiling Help and Manual projects. It is currently using a /mmh switch for the E-book output format. For H&M 3 the help file says it should be a /exe switch, and for H&M 4 the help file says it should be a /ebook switch.

This results in VBP not kicking off the build of the ebook.

You're right. It appears that this flag has changed over the years (something like v2=/mmh, v3=/exe, v4=/ebook). We'll inquire with the vendor and get it fixed properly. In the mean time, you can uncheck that option and enter /ebook="c:\path\to\file" on the Options tab.

Thanks.