I too have trouble with the tabs and other code formatting details getting lost when pasting in a note. This however does not occur when in the webversion of EN. Then code formatting stays in tact. Even when saved and then viewed in Evernote desktop client, the formatting is preserved. It is kind of a hassle and by no means a permanent solution, but it is at least something until the EN guys crack the code on this subject . Hope this helps for some people!