Hi
If you haven't updated EigenD and your system has become flaky when using it it's unlikley to be EigenD that's the problem, it's more likely that something else has changed and caused problems. Could you describe your system to us (OS, Audio Interface, amount of memory etc)? And what version of EigenD are you running? It might help to see what's going wrong. Also, please try using the bug reporter - this sends us a load of useful information and can make diagnosing issues a lot easier. Could you also confirm that this isn't a new install of EigenD, ie, on a new computer?
One thing to check is also to make sure that you have all your instrument cables firmly plugged in and latched. We had someone report intermittent flakiness like this a year or so ago, and that's what it turned out to be - when the connectors are only partially connected they can occasionally work intermittently and cause effects like this and it's surprisingly easy to make that mistake with those little Neutrik connectors, which are neat but less positive than we'd like.
You shouldn't need to update to 2.0 for any major stability reasons. The last 1.4 release was very stable - a lot of people are still using it in live situations quite comfortably and as far as we're aware the OS vendors haven't broken it yet. 2.0 does have some stability improvements over 1.4 but nothing that should be troubling you, we worked hard to make 1.4 a good reference release.
2.0 brings you a much more powerful system and we think, due to the extensve testing and hundreds of bugfixes we've commited in the last six months, that it's probably our most stable EigenD to date, but you really don't need it to play your Tau.
John