Oddities
There seem to be some odd results occurring, adding a note here to hopefully work out what's going on or work out a clearer solution.
Uses Traces Through {{Disambig}}?
The "uses" clause, which should return a list of pages that use a template seems to trace through {{Disambig}} pages and also include those pages. For example, this DPL should return pages with titles prefixed with "Ice" and using {{Problems/WidescreenGCNAuto}}, a template only used on GameCube titles...
<dpl> uses=Template:Problems/WidescreenGCNAuto titlematch=Ice% </dpl>
...but, as seen above returns, a related {{Disambig}} page and a Wii title page linked through the disambig as well as the expected GameCube title result. Only the GameCube title page actually uses the template.