Thanks, Chris. That was enough of a clue to get me to where I needed to be.
Here's what I found for others having the same problem:
In 3.6.3, the 'explodeWar' task has been renamed to 'unzip'. The
'explodeWarOnly' task has been renamed to 'unzipWar'.
The 'listTemplateViews' & 'getResource' tasks used to depend on 'explodeWar', but in 3.6.3, that was changed to 'unZipWar'. I changed both of them to depend on 'unzip' and now both tasks work fine.