Hi David!
If you visit Account Central > Downloads the release dates are indeed for the initial release of each plugin, but I am assured the relevant plugins which had hotfixes applied to them are indeed the ones you are now able to download.
I also tried to see if disabling the Pro plugin would make the issue go away – as the core ‘the events calendar’ is not affected – but the issue persisted.
I’m not sure the problem you are describing is something that the hotfix was intended to combat (columns missing in the events list) and it sounds rather different. Have you tried the regular troubleshooting steps of deactivating all other plugins – except of course for your Modern Tribe plugins – and at the same time reverting to a default, unmodified theme such as Twenty Twelve or Twenty Eleven?