The PMDG 737 aircraft different liveries don't show up when I start P3D V4.4, I see the PMDG default liveries only, I removed and re-downloaded different liveries but nothing shows up except for the default PMDG liveries, I have the PMDG B747 and PMDG B777 which both aircraft liveries show up with no issue,  the issue that I'm having is only with the B737 liveries. Does anyone have this issue before or can help on fixing this problem?

Regards   

Look by aircraft developer. It’s likely that - since the list is alphabetical- you’re looking for PMDG 737 etc, instead of the liveries being up in Boeing 737 etc.