Unable to create vertex buffer

i played this game since a long time
without any troubles (beside instant crahes realted to my scorching ray build once)
but since last big update

i loosing progress and even temples to something like:

"": In soucre file
f:\buildsave\build\production\source\windows\visual\device\d3d9\VertexBuffer
D3D9.ccp at line 61,
Processing file:
Error -2005532292
Message: Unable to create vertex buffer.

"Art/particles/monsters_particles/League_Incursion/Vaal_Architects/spells/breach_
portal/breachscrolls.dds":In source code file:
f:\buildsave\build\production\source\windows\visual\device\d3d9\TextureD3D9
.ccp at line 364
Processing file:
Error -2005532292
Message:

starting new leeds to the same result

any pro around here knows a solution
sadly i know GGG doesn't care for normal bannerless players like me
even i had my chest full of premium tabs :(