Issue with the Dropbox application v52 (freezing/ crashing) on Mac devices.

I have an identical problem.

Running MacOS X 10.10.5 Yosemite on a MacBook Pro Early-2011 still in top shape.

I've been a happy Dropbox user since at least 8 years. Then suddenly it stopped working.

I tried Jay's solution and did a clean advanced reinstall of the desktop app.

Twice.

Every time, double clicking on the installer makes the Dropbox icon appear in the top menu bar, but it's greyed out and stays there for a few seconds before disappearing completely.

Below are my latest console logs relating to Dropbox, hoping they could provide helpful info (I notice geeky names: "garçon" and "café" ;-) ):

2018-06-21 20:19:53,221 pkd[294]: UNINSTALLED:com.getdropbox.dropbox.garcon com.getdropbox.dropbox.garcon(2.0) BAE76418-349C-4FFE-A73D-3A14A5DED27A /Applications/Dropbox.app/Contents/PlugIns/garcon.appex
2018-06-21 20:19:53,279 pkd[294]: PLUGIN REMOVAL:com.getdropbox.dropbox.garcon RESULT:3
2018-06-21 20:24:09,906 sudo[575]: jean-huguesroy : TTY=ttys000 ; PWD=/Users/jean-huguesroy ; USER=root ; COMMAND=/usr/sbin/chown -R jean-huguesroy /Users/jean-huguesroy/Dropbox
2018-06-21 20:24:18,518 sudo[579]: jean-huguesroy : TTY=ttys000 ; PWD=/Users/jean-huguesroy ; USER=root ; COMMAND=/bin/chmod -R u+rw /Users/jean-huguesroy/Dropbox
2018-06-21 20:24:25,720 sudo[582]: jean-huguesroy : TTY=ttys000 ; PWD=/Users/jean-huguesroy ; USER=root ; COMMAND=/bin/mv /Users/jean-huguesroy/.dropbox /Users/jean-huguesroy/.Trash/dropbox.old
2018-06-21 20:24:44,687 sudo[588]: jean-huguesroy : TTY=ttys000 ; PWD=/Users/jean-huguesroy ; USER=root ; COMMAND=/bin/mv /Library/DropboxHelperTools /Users/jean-huguesroy/DropboxHelperTools.old
2018-06-21 20:24:56,589 sudo[592]: jean-huguesroy : TTY=ttys000 ; PWD=/Users/jean-huguesroy ; USER=root ; COMMAND=/bin/mv /Library/DropboxHelperTools /Users/jean-huguesroy/DropboxHelperTools.old
2018-06-21 20:25:54,000 kernel[0]: hfs: could not initialize summary table for Dropbox Installer
2018-06-21 20:25:54,000 kernel[0]: hfs: mounted Dropbox Installer on device disk1s2
2018-06-21 20:25:54,529 mds[56]: (Volume.Normal:2464) volume:0x7f8fce09b000 ********** Bootstrapped Creating a default store:1 SpotLoc:(null) SpotVerLoc:(null) occlude:0 /Volumes/Dropbox Installer
2018-06-21 20:26:49,000 kernel[0]: hfs: unmount initiated on Dropbox Installer on device disk1s2
2018-06-21 20:26:51,891 pkd[287]: INSTALLED:com.getdropbox.dropbox.garcon com.getdropbox.dropbox.garcon(2.0) <__NSConcreteUUID 0x7f9791d62240> B421A841-AC0F-4761-82DC-47B9DB43EC1E /Applications/Dropbox.app/Contents/PlugIns/garcon.appex
2018-06-21 20:26:51,937 pkd[287]: enabling pid=271 for plug-in com.getdropbox.dropbox.garcon(52.4.58) B421A841-AC0F-4761-82DC-47B9DB43EC1E /Applications/Dropbox.app/Contents/PlugIns/garcon.appex
2018-06-21 20:26:52,740 garcon[651]: Connecting to Dropbox on 'com.getdropbox.dropbox.garcon.cafe_501'
2018-06-21 20:26:52,740 garcon[651]: Could not connect to Dropbox on port com.getdropbox.dropbox.garcon.cafe_501. Trying again later.
2018-06-21 20:26:52,893 Dropbox[643]: [643:7191:20180621,202652.892466:WARNING task_memory.cc:96] mach_vm_read(0x0, 0x1000): (os/kern) invalid address (1)
2018-06-21 20:26:52,893 Dropbox[643]: [643:7191:20180621,202652.892635:WARNING thread_snapshot_mac.cc:453] !! dropbox: failed to read tsd
2018-06-21 20:26:54,856 ReportCrash[660]: Saved crash report for Dropbox[641] version 52.4.58 (52.4.58) to /Users/jean-huguesroy/Library/Logs/DiagnosticReports/Dropbox_2018-06-21-202654_JulesWinnfield.crash
2018-06-21 20:27:19,814 com.apple.xpc.launchd[1]: (com.getdropbox.dropbox.239160[668]) Service exited due to signal: Segmentation fault: 11
2018-06-21 20:27:19,885 ReportCrash[660]: Saved crash report for Dropbox[668] version 52.4.58 (52.4.58) to /Users/jean-huguesroy/Library/Logs/DiagnosticReports/Dropbox_2018-06-21-202719_JulesWinnfield.crash

I am having the same problem...this did not work. As soon as I go through it, and reload dropbox, it opens for a few seconds and then disappears...below is a photo of the output...nothing is working. 

Yes, like MVL - I am using OSX 10.11.16, so it it not just limited to Yosimite but also el capitan. 

I talked to support friday and my ticket had "priority" but I have still not heard anything as of 9:00am PST on June, 25. My guess is they are working something. I will check in later today and provide updates here. 

I've had the same problem since installing the security update 2018-003.  I'm operating macOS Sierra, v. 10.12.6.  I was in touch this morning with technical support and now have a ticket going.   Will keep you posted if/when I have a response...