[TxMt] ProjectPlus folders on top bug?

Hi, If I set ProjectPlus sort to show folders on top, the order gets messed up if I add a file to a project folder outside of TM. When I switch back to TM the project list updates to show the new file, but the folders are now mixed in alphabetical order, rather than at the top. I then have to uncheck "folders on top" and the re-check it to restore the order.

Is this a bug? If I add the file through TM (using the 'add existing files...' option, this doesn't happen, it's only if I add a file into a folder that is in the project, and the re-sort happens when TM regains focus and the project drawer is redrawn.

Thanks, Nigel