Sorry to hear you're having trouble Deniz. I've just tried to replicate the issues and wanted to check back in with you. What type of instances are you adding? I've just added 4-5 instances and removed 2-3, all without any issues. Is CloudMan reporting any errors or any indication in the log as to what's happening with the non-functioning instances? You can get the full CloudMan log from the Admin page.
Entering the share string directly on CloudMan at startup is not working for instances that have been shared before July this year. It's a chicken and egg problem that has no good technical workaround and as a result we're likely to remove that option all together in the near future. Instead, you should provide the share string at instance launch time in
CloudLaunch or as part of user data.
The resizing issue seems to be a bug so we'll need to take a look at this and let you know once fixed.
Again, sorry for the trouble,
Enis