Hi all,

we have the same issue at the moment here in Wuerzburg, and we are running into troubles with a series of studies that we are running right now. At present, we are losing every other to ever third subject due to the error. So this is somehow pressing. Here's a detailed description:

* Some bitmap stimuli are not presented during a directRT session. Instead, a little icon occurs that looks like the "middle" of the three Windows window action buttons (not minimize, not close, but the maximize button when the window actually IS maximized. It has two little windows on it).

* The error occurs in multiple experiments (i.e. different drt files) and on multiple computers with different specs.

* In a way, the error occurs randomly:
- with different bitmaps (the same bitmap is sometimes shown, sometimes not)
- with different .csv files (the error sometimes occurs with a given .csv, sometimes not)
- at multiple positions within the .csv / within a session (sometimes the primes are not shown, sometimes the targets, sometimes the masks)

* In another way, the error seems to occur systematically:
- if it occurs once in a session, it occurs more than once
- many sessions are totally error free

* I just had the situation that it ALWAYS occured with a given .csv (10 sessions in a row). I than restarted the computer and it was gone in 5 sessions. But this may be random.

* The error is not visible within the logfiles. Error trials just look normal. This makes it really troublesome.


Again, this is really pressing as we do not have control over the phenomenon. At the same time, it seems not to be bound to a given program. It occurs with multiple programs written by different people.

Any help is highly appreciated.

Roland