Occasionally the radio typing box will become invisible and your text is unable to be seen until it appears in the text buffer.
This is inconsistent and I have not been able to duplicate it at will.
It also resulted in AH2 crashing while in flight.
Athlon 64bit 3000+
MSI K8T Neo
9600xt with Cat 4.6s
1gig DDR400
WinXP home, SP1