Flybe are all over the place again today with evening IOM-MAN and BHX flights badly delayed, amongst many others (Ireland and Scotland in particular).
Presumably staff will also be getting fed up with the current situation, not least the harassed ticketing staff at IOM Airport.
I've received an email from Flybe saying that the Manchester flight will be operated by VLM next week (confirming what Tonyq says above), so I hope that this is an effort to sort out the problem.
Otherwise I can see serious questions being asked by people with more influence than me.