Since I use nightlies and not the stable builds (there are not many of them and they are quickly horribly outdated), there have been issues from time to time with certain builds, such as frequent crashes or features not working properly, but the developers have always responded quickly to any feedback on their forums. If one particular build annoys you, you can always use a former until the issues are fixed (usually does not take more than 1 or 2 newer builds iff you report the issue).
For instance, in the current Windows build (8438), I have issues with CB's "image" freezing as a screen overlay when (sometimes) minimizing, forcing me to restart CB (but everything is saved, so not a big deal), though the Debian build (Jens') is working perfectly.
Like JTippets said, just save often enough, make use of autosave, or do as I and use both (since I will never trust autosaving features
).
