JCL,

Zorro's IB Plugin uses API ver.63 while the "Latest" is 148.

Numerous improvements had been done along the way, incl. low-level connection reliability, "virtual" FX positions (e.g. EURJPY, EURGBP, etc), "Smart"(aggregated) depth for stocks,historical tick-by-tick, automatic pacing, and many others, more or less significant.

Seems about time for an update...