Rekordbox 3 won't open on my Macbook

1) Operating System: OSX 10.9.4

2) OS Type: 64bit (i think)

3) rekordbox version: 3.0 2369

4) Using LINK: N/A

4a) LINK Connection method: N/A

4b) Using with CDJs: N/A

5) Hard drive / Flash drive / SD card file system: N/A

5a) Does the device have multiple partitions: N/A

5b) If it's a flash drive, is it a U3 device: N/A

5c) With what utility did you format the device: N/A

6) Have you scanned your files for errors: N/A

7) Have you scanned your drive for errors: Yes

8) Is rekordbox crashing at all: Yes

8a) If crashing, is it resulting in: just hangs when I try to open it

8b) If not crashing, are there any error messages: No

9) Are you able to repeat / reproduce the problem: Yes

9a) If yes, can you do it consistently: Yes

10) Does the problem occur with one specific song: No

10a) If yes, please post a link to it: N/A

11) Any other notes regarding your setup only: I went through the instructions posted on this forum on how to sync libraries between 2 computers via dropbox. It involved typing something into terminal. I never got it working. I've never had a library happening on this computer but it use to be able to open before I upgraded to RB3. I've tried uninstalling and re-installing RB3 and it won't open.

12) Provide as much detail of the issue here: I click to open it, it flashes the start up box for a second and disappears, then I get the spinning beachball and I have to force quit