I seem to have the problem almost always when returning to an old puzzle and double tapping. I noticed this time, though, that I can tap outside this congrats popup and it disappears. (Previously it was frozen and tapping anywhere didn't have any effect.)
New issue. I'm solving N3 #1 but some words have no clues.
I have had issues with kanji puzzle layout getting scrambled. The entire puzzle is displayed in a single column. Here is what a new puzzle looked like after I answered the first question. The column extends off both the top and bottom of the display.