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Yeah, sorry, I copied them from a 7I96S halshow and forgot to delete the "s"

Thank you very much, I will try those fixes and get back to you.

I also wanted to mention that when we manufacture this machine with new pc hardware and this new software we get the latency warnings but the machine performs without issues. I don't know if that is relevant or not.

Fixed the outputs and inverts for 7i95t, 7i96, 7i96s, 7i97 and 7i97t.

JT

Yes, that is the BOB with very slow optos, and as long as you get latency warnings, the steps might and will be missed, so
-Set the base period to 100000
-set the drive microstepping to 1600
-set the parport reset time to 10000 in the hal file
-set the step time and space to 10000 in the ini
If you still get latency warnings, in BIOS:
-disable hyperthreading
-disable TPM
-disable "aggressive PCI-E power something or another"
-disable any power saving option, like C states, turbo, speed step, etc

The drift might be something physically slipping. Mark any shaft-to-pulley or coupler joints to be sure.
Hopefully it isn't the encoder slipping on the motor shaft, that would be very difficult to detect or fix.

It is unlikely to be lost steps in a closed-loop system, and also unlikely to be lost encoder counts, but it's not entirely impossible.