Yeah i got this problem on my SRCDS dedicated server.
i add workshop.vdf in my garry's mod folder.

"addons"
{
"1" "105979856"
"2" "105115318"
"3" "109905241"
"4" "104479034"
"5" "110138917"
}

i don't know why sometimes my addons load but sometimes it don't.
can you help me please ?

Tanks. -High