[HappyCatMachine]

Good to know I'm not the only one seeing this. It's most frequently with OmniFocus but also occurs in other apps that do processing whist one types. It could very well be a bug in the OS that doesn't see they key up until in finishes doing something and thus has time to register the repeated character...once.

I cannot remember where else I've seen this though it hasn't happened lately so there's a good chance it's apps I've tried and abandoned.

I'm only speculating though, if it can be fixed at the application level that would be wonderful :)