@Axel-Spoerl said in A Strange Qt and postgresql problem ! when using Kaspersky: If everything is configured properly and you use pgsql > 10.7, the only idea I have is that Kaspersky (partly) blocks network traffic coming from an executable, which it doesn't know. But that's where my knowledge ends and you have to turn to the Kaspersky support. Thank You so much bro <3 for great support by the way i am using postgresql version 14 the latest one i agree with you there's a problem on kaspersky they partly affect any unsigned software when connecting to postgresql ... (kaspersky set my tested softwares as (low restricted which is the best group when application doesn't have digital signature) in application control Low Restricted. This group includes applications for which the following conditions are met: Applications are not digitally signed by trusted vendors. Applications are not recorded in the trusted applications database of Kaspersky Security Network.

@Chris-Kawa Thanks for the insight. I think the system I am working on is similar in evolutionary history. There are just a few setupUi() methods in it and the rest of the uis are heavily wrapped in extended classes. I think all I need is that first clue but I may be able to suss it out myself. That would be nice...pat on the back sorta nice...:-) Again, thanks! I appreciate the help!

@Kent-Dorfman Thank you for the hint. I did see it in some examples and noted it for future reference. I forgot all about it by the time I was working through (working/tutorial) examples I found online. I will be using the Q_OBJECT to change my existing (toy) program(s) to see how it works out.