You may be interested in a Help Article on our web site:
"Is ENVI 5.2 / IDL 8.4 compatible with Mac OS X 10.10 Yosemite?"
http://www.exelisvis.com/...X-1010-Yosemite.aspx
IDL 8.4.1 is our current version, and it does not yet officially support Yosemite, because Yosemite was released after IDL 8.4 was released. However we have many customer successfully using IDL 8.4 and 8.4.1 on that version of the Mac OS. The above help article describes some problems that a minority of those users have encountered. Using IDL 8.1, which was released many years before Yosemite was released, is much less likely to work, and we will be unable to provide assistance for that configuration.
- Peg
Exelis VIS