From today's meeting minutes:
- Due to hardware failure, SeaMonkey 2.18b5 and SeaMonkey 2.18 are cancelled.
- Instead will go directly to 2.19 series of betas and by the 24th June, the 2.19 final. This means that users of 2.17.1 will be going directly to 2.19.
- If Firefox decides to do a dot release, we might go for a 2.18 later.
Meaning, you'll have to stick with 2.17.1 for the time being. An alternative may be 2.18 beta 4, which was released early May, but may not have all the security patches that went into the Gecko 21.0 branch.