DropDMG 3.1.3, EagleFiler 1.5.10, and SpamSieve 2.9.3 have been tested with OS X 10.8. If you haven’t already updated to the latest versions of these applications, now is the time to do so. Any known issues are listed below, and this post will be updated should any new issues arise:

EagleFiler

• Due to changes in OS X’s Core Data subsystem, new EagleFiler libraries created on Mountain Lion will not open on Tiger (Mac OS X 10.4). Existing libraries created on 10.4 through 10.7 can be edited on 10.8 and will remain compatible with 10.4.

SpamSieve

• In rare cases, Apple Mail will fail to auto-launch SpamSieve the first time after you update to Mountain Lion. To fix this, double-click SpamSieve’s icon in the Finder, choose “Install Apple Mail Plug-In” from the SpamSieve menu, and restart your Mac.
• If you bypassed Lion and updated to Mountain Lion directly from Snow Leopard, Apple Mail will have deleted your SpamSieve rule. You can re-create it by following Step 3 of SpamSieve’s Apple Mail instructions.
• If you are using the drone setup with Apple Mail, your AppleScript file needs to be moved due to Mail being sandboxed under Mountain Lion. Please see the script page.