If you open an HTML file twice, once from the FileSystem node and once from the Project Explorer, then close one of those files, the colorization of the remaining file will disappear.
Steps to Replicate :
1) Open Aptana Studio
2) Open an HTML file from the Local FileSystem node in Project Explorer
3) Open the same file from Step 2 in a project
4) Close one of the file instances
Actual Results :
Colorization will disappear from the remaining file instance.
Expected Results :
Colorization should remain.