from their FB page:

Sorry to double post but I have found a solution:
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Hi, I have both HD 6870 and HD 7950
My system - Ubuntu 12.04
See both of them: but cgminer only 1:What might be going on here?

Usually people use cards only for mining, and when playing you can stop mining.

Generally you can play at lower intensity of mining, but usually it's not worth it.
I recommend either getting  a second card for mining and keep your current card for playing or stop mining when you play

I also have the same problem

At the moment you can mine without problems but their website is not updating. I'm not sure why is that, but I have moved onto other pool until they fix that.

Take a look here https://en.bitcoin.it/wiki/Mining_hardware_comparison for the list of graphic cards and their performance

scrypt and sha-256 are different algorithms and in short words: scrypt needs more resources (more and fast RAM) than currently available FPGAs or ASICs don't have.

You can read more here: http://en.wikipedia.org/wiki/Scrypt#Introduction also some more info here: http://security.stackexchange.com/questions/16354/whats-the-advantage-of-using-pbkdf2-vs-sha256-to-generate-an-aes-encryption-key

I have this error when trying to access it:

BTC-e also has lower withdraw limits and supports more crypto currencies.

It's also worth adding that any of the "scrypt" currency is quite unlikely to be mined using ASIC in near future

I think you have to specify configuration for your card, take a look here https://en.bitcoin.it/wiki/Mining_hardware_comparison on the right you have specific configs that people use.

for example:
Anyway, I recommend following steps from this tutorial: https://docs.google.com/document/d/1Gw7YPYgMgNNU42skibULbJJUx_suP_CpjSEdSi8_z9U/preview?sle=true It worked for me very well.

You can compare (and put) your results here: https://en.bitcoin.it/wiki/Mining_hardware_comparison
I think this is the largest list of different hardware and configurations

You can rent it in some other currency, so you'll get better value than exchanging it on the exchange.

Is it this one: https://play.google.com/store/apps/details?id=com.kensenter.p2poolwidget ?

For cgminer you have to write a script that will run in a loop and restart it when it crashes.
More details are here: https://bitcointalk.org/index.php?topic=51622.msg615755#msg615755

The larger issue is that there are different encryption algorithms used for both currencies:
bitcoin uses SHA-256
and litecion uses scrypt

Both algorithms have different properties.

SHA-256 requires very few memory, it basically can be designed as a set of logic gates. This can be done very easily in a FPGA or ASIC.

Scrypt on the other hand needs a lot of memory, which makes current FPGA or ASIC boards practically not usabe usable for this kind of algorithms.

So at the moment there is not known implementation of scrypt for FPGA/ASIC and it's quite unlikely that one will appear in near future.