The original issue I had revolved around DNS lookups. My 7.0 app worked fine on older modules, up until the module which has an R under the end of the bar code. The next module we got had a T under the end of the bar code. With these modules, DNS lookups no longer worked. This was confirmed and I worked with Charlie to get a fix. The fix was two-fold. One, I had to make a few changes to my app to disable secondary interfaces, and two was to upgrade to 7.3. However, with my 7.3 apps, I am finding that they will work for a while, then lock up as described earlier (and that may or may not be related to 7.3, or my code) , and when that happens, I can't recover because the TFTP recovery method doesn't work. If I could recover, I could probably figure out if the lockup I am experiencing is caused by 7.3 or my code. But since I can't recover, I'm doing nothing but making $50 bricks.