AMH
Noel Borthwick [Cakewalk]
IIRC this was fixed post X3. There were several MIDI tenderingissues fixed with CCs.
I have this exact issue and I'm running X3e, which is latest X3 update. Really, Cakewalk, is a bug this serious still unfixed?
Under the old upgrade model each major release happened around the end of a year and one or more patches would be provided throughout the following year to address new issues and some outstanding issues carried over from previous releases, and sometimes to add new features. At a certain point, all development effort would go into the next release, and patching of the current release would cease.
This issue never got fixed in the X3 cycle, but was fixed some time back in 2015. I suspect that one reason it didn't have higher priority is that it has an easy workaround: use the default Fast Bounce mode to render. There are few cases where it's imperitive to do a real-time bounce of a soft synth so the impact is minimal, and of course, Fast bounce has the benefit of being faster (duh).
Also, since there's no such thing as 'real-time Freeze', I'm not sure why the OP said Freezing was affected. As I recall, this was only a problem with real-time bouncing. And it didn't affect MIDI sent to hardware ports, either.