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Thank you, looks like the electrode is really broken or it has no contact (possible as well...)
I searched the forum and couldn't find any information about how to measure (e.g. a voltmeter or similar) an electrode when it is broken. If this is due to a broken wire which gives contact somtimes and ...

I think you should try to get the source of the problem fixed not filtering the data. DC drifts will occur only if preparation is not done in an appropriate way or sweating artifacts may cause the drifts. DC recordings require some patience as well after inserting the gel. So make sure the ...

Post your question to the EEGLAB forum! It is made for questions like this...

How about writing to the EEGLAB forum? How should the guys from Biosemi know?

Drifts are best to be avoided during recording, you are right. (GiGo)
But it might be possible that you are processing the data wrongly. Which program are you using and at which stage of processing are you filtering? (Wrong baseline? Filtering epoched data?Slope?)

Best way to find out would be to contact the BrainVision people, don't you think?

There are several gels which will do the job. Signa is fine. But most interesting is to know how do you measure impedances and why?

Have you tried to click the links? They are not active. Without photos - just assumptions....
Pin broken? As long as there is a signal - fine. Wire broken? Send it back...