I'd like to say I'm surprised that version 13 appears to be full of bugs, but I'd be lying.
You can develop software quickly OR you can have something that works ; you can't have both.
Sage have followed the strategy adopted by many other companies in the past of having a release a year in order to drive sales. Witness Windows 98 and Windows 2000 etc. However most of these companies have dropped this concept because it makes a rod for your own back having to come up with new features every year and a constant unrealistic development cycle. It also means having to support an increasingly large number of versions.
Best advice for users is to stick to a version that works until you actually need the features offered in a new version or Sage threaten to remove the upgrade path. Then make sure you wait for the bugs to be found in the new version before you commit to the upgrade.