Not a crash or anything of that sort.
For the minimap options gotten to through using the 'm' key and under Details / Performance when toggling Block Transparency off it turns the chunk grid off (with out actually changing the chunk grid toggle button).
Doing this does seem to cause the Chunk Gird toggle button to do nothing while transparency is in a off state and it also does not actually change the transparency option.
Only things added to the pack is Optifine and I'm using the soartex modded texture pack.
For the minimap options gotten to through using the 'm' key and under Details / Performance when toggling Block Transparency off it turns the chunk grid off (with out actually changing the chunk grid toggle button).
Doing this does seem to cause the Chunk Gird toggle button to do nothing while transparency is in a off state and it also does not actually change the transparency option.
Only things added to the pack is Optifine and I'm using the soartex modded texture pack.