Final cut pro x corruption after combining events

Question

Hi,
I installed the trial of Final Cut Pro X 2 days ago to determine if it will work properly for me.  It seems that I am getting sporadic corruption when merging events, which may turn out to be a show stopper.
I am doing small merges - 2-3 events with 2-3 short clips.  In general it has been fine, except yesterday I got 2 clips correped during a merge, a crash of the app which corrupted a day, and just today 5 clips from a single merge got corrupted.
Note I using the FCPX event libray and dragging/dropping to move clips around.
Any ideas of why this may be happening and whether this is a known issue?
iMac 2.8 dual core, 4G, plenty if disk (260G free)
all of the latest OS patches as well as the latest FCPX.
Nothing else significant has been running concurrently.
If there are any missing details, please do let me know.
Thanks,
Gary

Answer 1

Hey Andy,
Thanks for the response.  To start I am a complete newbie to FCPX and have had very limited exp in iMovie. The importing was terribly slow for iMovie and I never got around to actually editing.  I have a pretty lenghty response below so as to provide details.
Workflow:
1)  I had done an import of files from an archives as well as my iMovie directory (as I had some clips which were missed from my orginal import into iMovie).  For iMovie, I had really just been building an collection of videos which were very disorganized.   I had lots of events which were date1_1, date1_2, date1_3, date_2, date_3... So checking out FCPX, I figured I would group clips mostly by an event of MONTH YR, except where there was an actual event such as a birthday. 
This really cleaned up my events.  As a next step, I plan to further review and break out additional events.
2) workflow going forward (current plan anyhow) - please do let me know if you have a different recommendation
now - import new footage -> either put it into the generic MONTH YR event, or put into a new appropriately labeled grouping ->  some time in the future actually do something with all of this video I have taken.
On a side note, it appears that I did not have corruption, but clips that had to be re-linked. I just did a re-import from iMovie or the camera archive and that seemed to do the trick.  I understand, in the future I just need to re-link
Codec:
I have the optimized video selected, however, it was just taking too long on my computer so I had stopped the transcode on several occasions..
Location:
all on my primary drive - 4T 7200
Memory:
The cpu seems to be the bottleneck - uses 150% of my dual-core.  The memory seemed to be okay, but I have ordered a 4G ram chip to replace one of my 2G to bring me to 6G.
I did have a crash during an import at some point and not sure about the impact on any files, so I have DELETED MY FCPX Events and am performing a new re-import.  I will not lose anything significant as I had only been reorganzing the video.  I do clearly have a     I have updated the prefs to only optimize.  The other options I will do adhoc.
After an import from iMovie, I will be importing from my 3 camera archives since not everything is in iMovie...so this will mean dupes.  I know that FCPX will prevent dupes from a particular source, but now we are talking about 3 sources which will have duplicates.  Any recommendations here?
Thanks,
Gary