All placed tiles are invisible until relog, at which point only those placed before the relog become visible. Any new tiles placed still become invisible until the next relog.

Versions used:
LittleTiles v1.4.8 mc1.10.2
CreativeCore v1.7.3 mc1.10.2
Forge version 1.10.2-12.18.3.2221

Tested both with and without Optifine

Does this fixes it?
https://www.dropbox.com/s/18bfc71wuat0xqo/LittleTiles%20v1.4.10%20mc1.10.2.jar?dl=1

It does indeed. Thank you!

Thanks for reporting this issue.