Hello list

I have an application that uses plugins. It loads a plugin when asked to execute a specific function and unloads it again when another function is asked for. The application is as SDR program. It ran without problems the last 4 years, however, after the most recent upgrade of Fedora, where now Qt 5.7 is used. It does not work aymore.
Recompilation of the main program and the plugins seems OK, however, when loading a plugin, the pluginloader reports "Plugin verification data mismatch ".
My sources are unchanged. The only Qt on my system is 5.7.

Is anything changed in plugin handling from 5.6 to 5.7?

Suggestions welcome
best
jan