Silverfish Blood (item) in the 1.6.3 release of HEE for 1.7.10 seems to have an issue of opening the HEE Ender Compendium screen no matter how you click on it, making it a pain to move about the inventory/to other inventories unless you use a few tricks.

MC 1.7.10
Forge 1208
HEE 1.6.3

Not sure what other information to provide since nothing is in the logs regarding it. If you need anything else let me know.

NEI is installed I assume, there was a bug with compatibility code. Redownload 1.6.3.