Actually I have studio 72 although have two versions of hana db. Our dev is currently 72 and staging and production are both 68. I've had no problems writing procedures on the 68 server for the past couple of months with 72 studio. We have mostly abandoned any development on 72 due to some bugs that we are waiting for 75 release for. I finally ended up deleting my METADATA folder in hdbstudio folder and then reset all my connections, repository, new project, etc which was painful and it worked for about 10minutes and then failed again! So I'm now dead in the water and panicking.
-Patrick