QT 5.1.0 : Text rendering of Indian Languages especially Tamil & Telugu is not proper.

Text rendering of Indian Languages especially Tamil & Telugu is not proper.

Particularly in Tamil, the rendering of dependent vowel signs (0BC1 & 0BC2) are not as they should be!

But,the rendering is normal and as it should be in QT 4.8.4.

The issue is only with QT 5.1.0.

The Sample application i tried is : "Application Example"

Sample text : "తెలుగు தெலுங்கு"

I am new to QT and evaluating it for a major project which will have to deal with almost all Indian languages.

Also please suggest what can be the work around till this bug is resolved!

Note : I am attaching the screenshots.