You can ask other buyers to rate theme 5 stars.
I think he was referring to the WordPress admin theme preview, not the live preview on Themeforest. If the preview in the admin isn’t working and the theme gives a blank screen, there is likely a PHP fatal error happening.
Probably. But then it is not the same theme as in live preview if live preview works. Might be an error in zip files upload.
Better to produce fixed layout because responsive grid is not so good.
If he is not answering than its not good, Its quite odd in TF that a author is not replying to his customer.
Authors with lot of sales and customers have lot of support questions and it is not so odd not replying to all of them very fast.
donkified, you said that theme preview doesn’t work. I would never buy theme if that’s the case. If theme preview works fine then it is not very likely theme isn’t working at all only in case author didn’t upload right files for download, which would be really strange.
Contact support and they will check the theme.
It could be virus in heart. Ask doctors for more detailed test like ultrasound of heart. If that is the case then exercises are absolutely forbidden while symptoms exist.
For typography you have 600+ Google fonts to choice from. For colors you can change all colors of text, backgrounds and icons.
Typography is not about possibility to change fonts. It is your job as designer to make it look good only with one or two fonts. Being good designer is not easy at all. You should learn more about that.http://design.tutsplus.com/tutorials/9-essential-principles-for-good-web-design--psd-56 http://design.tutsplus.com/articles/10-rules-for-choosing-the-perfect-typeface--vector-12548 http://webdesign.tutsplus.com/articles/an-introduction-to-color-theory-for-web-designers--webdesign-1437
Unfortunately design is not good at all you need to learn more about design and check other themes approved here and their design quality.