[PeterNL]

Result from "calibre-debug --test-build" (64-bit, v 1.23)
after lots of 'loaded' s and 'OK' s, it ends with:

Python function terminated unexpectedly
Qt doesn't seem to be able to load its image plugins <Error Code:1>
Traceback <most recent call last>:
File "site.py", line 132, in main
File "site.py", line 109, in run_entry_point
File "site-packages\calibre\debug.py", line 261, in main
File "site-packages\calibre\test_build.py", line 146, in test
File "site-packages\calibre\test_build.py", line 79, in test_qt
RuntimeError: Qt doesn't seem to be able to load its image plugins

The 32-bit version doesn't give this Error Code and message.