deco O2 with last deco at 3m (OC-GF). If I make all deco at 6m, when OSTC goes to 3m, time is longer than planned but deco descrease faste (1min OSTC = 30s deco). So at the end deco end at the same time (planned vs OSTC). Clear enough ?!?
In logbook, only the last dive is saved and worth part I can't upload it with JDivelog.
I return to 1.6 and everything almost perfectly. I can see dive with 1.65 in logbook but still can't upload it.
We made a lot of changes in the code around the Gas Changes recently, I'd recommend to wait for the 1.70 and use this version. You first point indicates that the gas change may not be properly configured.
Second issue: Hard to tell from the informations what went wrong. If it still does not work with the 1.70 I'd recommend to delete the logbook in the OSTC.