OK, I'm a n00b.
Turns out it was pretty simple. The line in the xml file that reads:
Code:
<Script file="ToolTipScan.lua"/>
should have been:
Code:
<Script file="TipReader.lua"/>
"ToolTipScan" was what I was calling the addon right at first. I changed to TipReader so that it didn't sound so similar to some of the commands I was using in the lua file.
Your tip about reading the log file is what helped me discover it. So thanks much for the help!