I have just upgraded an estate of TC70's from KitKat GA1 4.2 & GA3 4.3 devices to Lollipop 5.1.1 and i have found that the Screen Capture Scan Button functions have now stopped working and the scanner is failing on random devices.
 
I have applied the mandatory patch associated with the Lollipop OS to reactivate the scanner. The profile is correct within Datawedge and they are active, some devices, the scanner will not work altogether, but some will scan off the Datawedge Demo screen button but not the side scan button. I have reapplied the profile both directly to the autoimport folder of Datawedge and placed the Datawedge.db file into a holding folder (enterprise/usr) and imported it from there into the autoimport folder. Both of these methods work randomly to fix the issue but only some of the time.
 
In addition, the take screen shot function when pressing "power\volume down" has stopped. its suspicious that this also utilises one of the exterior buttons!