I do believe the issue is most directed towards early generation IQ180s (probably IQ160 too) used on technical cameras and not IQ2 series MFDBs. And as you'll recall there was quite a flurry of interest and sales when the new IQ180 was first released a few years back, so I don't think this issue is as isolated as people may think---they just haven't used/tried their IQ180 on a technical camera (yet) and attempted to trip the shutter.
Updating (at least attempted) updating to firmware 5.10.1 was pretty unsettling. Hell, successful updating of firmware can be pretty scary watching the MFDB screen flicker and blink as it does its thing. But to see the message "update failed" and then your MFDB reverting to factory defaults on its own is well, I handled it pretty damned good I'd say, particularly after the IQ180 also stopped working with my Phase DF too.
But I'm pretty comfortable working through things with MFDBs and Capture Integration was a great help. Incremental updates from there did indeed work, and
I'm currently on 3.01.13 which is stable and my technical camera and DF work fine again. In fact, I completed an assignment this afternoon without incident.
More work needs to be done and Phase will need to take an in depth look on further updating the firmware on my IQ180. I still don't have the promised USB3 capability on my IQ180
which requires an additional firmware upgrade and may even require a trip to the motherland in Denmark. (*note: further attempts to update firmware from 3.01.13 to even 5.00.51 were dismal failures and well let's just say it's unsettling to see the MFDB screen locked up and otherwise inoperable)
I don't think you need to worry about your IQ260 Graham.
ken