FAQ

No, it doesn't. Load resourcepacks as you wish

This is normal. The resource pack is not yet 100% ready.

It seems your graphics card cannot handle the full rotrBLOCKS or Pixlli pack in 512x resolution. Try replacing some parts of these resource packs with lower-resolution versions, such as DESIGN or ITEM. Create a mix of different resolutions that works best and runs smoothly on your computer.