As the title says, I've experienced this problem just this afternoon after I updating for the new version of ETS 2 Multiplayer (0.1.0.9 Alpha). There is no notification teks as usual at the Loading Profile Screen, so the Fanaleds stop working. Even with the FanaLEDsPluginETS2.dll are still in correct plugins folder. Restarting the program also not works.
After a couple search, found the culprit come from the ETS 2 Multiplayer Installer which generated the .dll file called mp_launch_helper.dll at the same place inside our plugins folder (Bin\Win_x86\plugins). This is somehow blocking the fanaleds plugin to works.
So, if you cross the same problem, simple just deleting those mp_launch_helper.dll from your plugins folder. Your ETS2 multiplayer still can running fine without that file. just remember in case there is another update for ETS 2 Multiplayer version, make sure you delete again those file in case it reappear again.