Thank you for your response! That was the one reference I could find on the web site, and did check that as well. I have the following:

12336 KB total

360 used

11976 free

and the following files

88695 config.bak

63148 config.tmp

88695 config

21057 crshdump.old

21374 crshdump.txt

12253 memory.txt

0 savelog.txt

You'll notice the descrepency between config.tmp and config. The time that config.tmp gets written is always the last time I try to save, and always ends in the same spot when viewed with a text viewer.

From what I can see, there's plenty of flash space, memory is good (about 20% utilized) and I can't find any hardware errors.

Image is version 4.7.2.0 and is one year old tomorrow.

Any other suggestions would be greatly appreciated.

This will sound odd, but give a shot to it, go to "Configuration | System | IP Routing | Default gateways" make sure the "tunnel default gateway" is not empty, if it is set it all to 0's 0.0.0.

Try again.

I have absolutely no idea how you would think of that, or figure that out, but it worked! Saved without issue. I can't thank you enough.