Since basic weldment profiles table coming with SW out of the box of simple rectangular and square tubes is not complete enough I used to add some new one right into the table in the configuration section and it worked all right for a long while.
But today I'm facing freaking out issue:
Opened ISO/rectangular tube.sldlfp file
went to the configuration manager -> tables -> rectangular tube
added the new string with the 80 x 50 x 4 configuration
saved the table, applied, OKed, tried to extrude and IT ALL seemed to be all right
But once I tried to select it and a structural member it showed me the error "Invalid member profile, check your library feature".
What is that?!?!?