This is most likely a font file issue; owing to a bug in Windows CE, PlecoDict will often freeze or act up like this when its font files are located on a storage card instead of in main memory. The demo version font is about twice the size of the paid version fonts, so we put it on a storage card by default, on the assumption that most people won't run the demo version more than once or twice and will be more irritated by an out of memory error than by the occasional freezing problem.
Anyway, if you want to verify that this problem will go away once you purchase the full version, soft reset your Pocket PC, then go into File Explorer and copy the "PlecoDemo.ttf" font file from your storage card (\\Storage Card\PlecoDict Demo Font or \\Storage Card\Program Files\PlecoDict) to the \\Program Files\PlecoDict folder. After that, run PlecoDict and it should work smoothly.
