Hi Steve

Yes I have a similar issue with my 5x7 super Technika III. I'm not certain this is exactly the same issue as yours, however the struts sometimes go out from their "channel." It is quite easy to put them back in the right place when you are close to the first position.
I also find quite hard to set the camera in the second or third position. It requires a strong pressure on the struts to engage/disengage them properly. To give you an idea, I have to put my camera on my knees and press the studs simultaneously with my palms to disengage them from position 2 or 3 (some anti-seize grease on the shaft and sanding slightly the nicks might help) however the camera does not look to have any mechanical problem. Everything is straight as it should be.
Hope it make sense.