737 NGX and FSUIPC

from the Intro manual page 21 : "During testing we have found that in extremely rare circumstances, users with FSUIPC installed would need to delete their FSUIPC.CFG file after installing the PMDG 737NGX in order to get everything playing well together. We recommend that you try this if it seems the NGX is not behaving normally after installation" after the 737 NGX installation that ran OK, I checked my FSX Add-ons menu and saw it was ..... empty : all the previous addons (except one : AI ships) including FSUIPC, they were all missing : FSlabs Conc_X, Maddog, Ivap, etc... (début de ma sueur froide ) After re-installation and re-registration of FSUIPC4 v 4.7.0.3, they all came back (fin de ma sueur froide... ) Is that related ?