Greetings! I have the same problem with Picolog6, on my newly purchased 2207B MSO. Running Win7 Pro 32bit on a Lenovo Thinkpad T510, 4GB RAM, Core i5 560 CPU.
Thanks for the suggestion (and for replying in the 'three dark days' between Christmas and the New Year!) - I've just installed the beta and the problem persists. I have installed 6.1.7 on another Lenovo machine (X60T), and the problem is there as well.
The restarting only occurs after I have plugged in the 'scope, connected it on the initial Picolog screen and configured a channel - as soon as I click "Add channel" and the red LED on the scope comes on, a relay clicks on and Picolog goes into the loop.
We have identified the problem and a fix has been implemented and is currently under test. This should be rolled out in the next stable release of the software.