It needs good drainage, and so perhaps your soil retains too much moisture. I have mine outside in full sun, and so overexposure to light would not be a problem. I water mine about once a week. They die back after blooming but put out side shoots.

Thanks, I'll change the soil, I think that may indeed be the problem. Does it look like it's going to die off entirely or does it still have a chance?

I'm no expert, but while you have the plant out of the pot I would wash the dirt off the roots. Then I'd check them and the lower stem for rot (black and squishy). If there is any rot it will need surgery.

There are many threads on cutting off rot from roots/stem/leaves and how far to cut. You could do a search on rot. But if you suspect rot take a photo of the plant showing the affected areas and people can guide you through.

If it needs rerooting this is a helpful thread about beheading plants and rerooting.

http://forums.gardenweb.com/discussions/4611851/beheading-plants?n=58

As I said I'm no expert and I may be saying all this when not needed.

I hope thats the case :-)

No sorry, don't wash the roots, just crumble the mix off DRY pls.

I'd suggest not washing roots of any succulents which are struggling, esp not Crassula. If the concern is rot already, let's not add wet the roots, unnecessarily risky & invites rot.

Helen you may not know this yet, but it does matter, washing a struggling succulent roots is just ill-advised.

I'm really sorry Karen and purple Haworthia, thats what I've been doing each time I repot out of unsuitable mix into much better mix. I thought that's what I had been advised. I must have got it wrong. Must have been in different circumstances. Thats a few stuff ups now, I think I'll back off and let those who are much more experienced give the correct advice. I would hate to be the cause of someone's plant dying.

Thank you all, I appreciate all the advice!

Helen Agius (Adelaide,Sth Aus), I also always wash off all the old caked on dirt from the roots.

Helen,

So do I. If it looks rotten, obviously you would cut off rot and let it callus before planting anyway.

Thankyou guys. I appreciate it.