Bump Bump
The other thing is I've found that if you press # when you finish speaking, about 1 second of your message is cut off, so you actually need to wait a second, then press #.
The other way to check your greetings - if you have access to the server - is to share out the directory C:\Program Files\3CX PhoneSystem\Data\Ivr\Voicemail\Data, so you can browse the files. Each extension has a subdirectory. However, no good for external extensions.