If I add a new account and try to map the account the Map Account selection is greyed out. Same is true for any old accounts existing in my KMM database.
It works fine for me. Where did you install from? Are you certain that at least one of the online banking plugins was enabled? Does File/Import show any enabled options? Are any of the import plugins shown on the plugin view of Tools/Configure KMyMoney ?
Installed from here. https://download.kde.org/stable/kmymoney/5.0.1/src/kmymoney-5.0.1.tar.xz.mirrorlist Preferred mirror. CSV, GNC, QIF Importer are enabled. File/Import shows they are enabled. CSV, GNC, QIF plugins showing in Tools/Configure. I can unmap accounts that are mapped. Can't map any accounts that are unmapped.
You downloaded the source from that link. You installed the version you compiled from that source (That is as opposed to installing with the package manager of some distribution.) I believe mapping only gets enabled if you have OFX import enabled (either using libofx or kbanking) and it looks like you do not. When you did the original cmake - did it complain about not finding anything it wanted? To me it looks like you need either libofx or aqbanking installed, or if they are, you need to help cmake find them. The cmake output (or typing "c" from within "ccmake ." in the build directory) should give you a hint about what's missing.
Thanks for the info. You are right. libofix and aqbanking were not installed. I marked this bug as resolved and invalid.