Qt - app doesn't load an SQLite database on other machines

I have an app that uses an SQLite database. I'm trying to get a demo version to work, so I can show it to the person I am making it for, it runs, but it refuses to do any sort of SQL. Importing a database, reading it, or creating a new one - nothing happens. Usually such things happen because one or another library is missing - but I doubt that's the case. qsqlite.dll is safe and sound in the sqldrivers folder in the root directory, and Qt5Sql.dll is in the root directory as well. According to Dependancy Walker I'm not missing any libraries. (also resizing images on resizeEvent() doesn't work... huh?!"

What could be the reason here?

/imageformats/qjpegd.dll
/platforms/qwindowsd.dll
/sqldrivers/qsqlited.dll
app.exe
icudt54.dll
icuin54.dll
icuuc54.dll
libgcc_s_dw2-1.dll
libstdc++-6.dll
libwinpthread-1.dll
Qt5Cored.dll
Qt5Guid.dll
Qt5Sqld.dll
Qt5Widgetsd.dll