Unfortunately Pushpool (The software I use to provide LP), has not been updated in some time.
I already have to alter parts of it to work with the modern front-end databases.
What is happening is a bug that causes a "Too many files open" error that stops Pushpool which stops LP support.
Stratum is provided by separate software that is not effected by Pushpool.
I have a major project and many smaller projects going on now and I do not have the time to look into fixing this bug. For now when I catch it it, I simply reset Pushpool and it runs fine until the bug pops up again. Not many people use the LP port especially now that cpuminer supports Stratum. I thought I read Cudaminer also started supporting it, but I am unsure.
There is also a stratum/LP mining proxy software package, but it may be too complicated for a beginner to setup. I can see about setting it up in place of Pushpool, but honestly it is not at the top of my list, mostly due to low demand for it.