Just for the record I have purchased from K&L several of their PRR Locomotives in the past 18 months. Currently only the K4's and L1's are active. The G5, M1, all the I1sa's and the OEG415 Doodlebug are showing up red in Surveyor and will not load, notwithstanding that the G5 and the Doodlebug are actually showing as "Modified" in Black in Content Manager and are supposedly useable!
Examination of errors for the I1sa (68926:4483900 and 4483903) in Content Manager is telling me that, " this asset is using an obsolete trainz build number below 3.5 which is not now supported." In the past weeks I have carried out numerous EDBR's with no evident improvement. The only change evident in this period is that the PRR L1 which was obstinately showing red in Surveyor, turned to Black sometime around March 20 and is now steaming as before.
I'm currently operating TRS19 build 110491 which appears to have no problems in running a vast array of other stock. If I didn't know any better I might think there was some incompatibility issue between the latest N3V software and stock from other sources.