Quick list of compatible LTTV and LTTng versions :

LTTng Trace version Comments
0.6.9 0.4.4 0.4 Traces cannot be written/read between 32 and 64 bits arch.
0.7.0 0.4.5 0.5

LTTV	LTTng	Trace Major.Minor	Comments
0.6.9	0.4.4	0.4
0.7.0	0.4.5	0.5	Traces can now be written/read between 32 and 64 bits arch.