MySQL Workbench 6.3 (Mac) hangs on simple queries

Question

I am using MySQL Workbench 6.3.7 build 1199 CE (64 bits) on a Mac with OS X Yosemite 10.10.5. I am connecting to an Amazon RDS MySQL instance.

When I enter a simple

Answer 1

UPDATE 3: The problem is fixed for MacOS HighSierra in MySQL Workbench 6.3.10.

UPDATE 2: It looks like the bug is recurring again in MacOS HighSierra. See https://bugs.mysql.com/bug.php?id=83658 for more details.

There is an unofficial build that fixes the problem. You can download it at: https://drive.google.com/drive/folders/0B2fTesDcrHzVRGVFWEdILWpuaEE?usp=sharing

The build was created by Bob Davenport. See https://bugs.mysql.com/bug.php?id=87714 for more details.

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UPDATE: The bug is fixed in MySQL Workbench 6.3.9.

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It is a known MySQL bug: http://bugs.mysql.com/bug.php?id=83658 caused by GateKeeper Path Randomisation introduced in MacOS Sierra. See https://weblog.rogueamoeba.com/2016/06/29/sierra-and-gatekeeper-path-randomization/.

A possible workaround is to remove the Quarantine ACL:

xattr -dr com.apple.quarantine "/Applications/MySQLWorkbench.app"