For some reason, some default based aircraft appear to be showing red strobe lights instead of white ones.
I have been able to replicate the error in the Headwind B789 and Black Square B350 which are both default-based aircraft. This error has been happening for a while now.
Having the same issue. I have also had this happen on FSX. Do you have any Captain Sim planes installed? I only noticed it after installing one of their planes. The only fix I know of is to uninstall everything. I tried uninstalling just CS products but the change remained. I play on xbox but if you play on pc you may be able to restore the effects folder. That will also remove any effects installed add ons specific effects so copy the file first.