Problem seeding older transfers

[guitarslim1]

All transfers prior to 3/31/16 are "waiting to seed." (Over 100). New downloads are "seeding" 'as normal. How do I fix this? I'm running Transmission 2.92, on OSX 10.9.5 Thanks

[pzee]

x190: Please, what do you mean by "re-verify all torrents"? Would that be, select one or more entries in the main window, go to Transfers menu, and select Verify Local Data from that menu? Apologies, just want to be sure.