Trouble with Image Previews (& raw vs dng)

Im new to Lightroom after using Apple Aperture for the past few years.
The install of Lightroom 5 was a brand new full install and has recently been updated with 5.3. The install was error free and i have only around 20 or so images in the catalogue. I have plenty of processing available on the iMac which is only 12 months old.
I have a random annoyance when i open Lightroom. Once opened, i select a RAW file that has had some minor adjustments such Basic Highlights, Shadows, Colors, Tone Curve, Sharpening and light Noise Reduction. Now when i select the image and move to Develop, some of the adjustments do not load, the most obvious one that i can see is Sharpening. I have waited for 30 seconds and it doesnt seem to load so i toggle to another image and the toggle back and all the adjustments are applied to the RAW file. Its completly random when it does this but is annoying to say the least.. If i stay on the image that hasnt loaded the Sharpening and Turn Off the Noise Reduction and Sharpening adjustment and then turn back on, the Sharpeing is loaded.
Anyone who can help would be greatly appreciated as im not techinically minded.
Many thanks

Hi Matt,
Not to muddy the water any but, with regards to DNG, it is actually the true open format. Now I am not a follow the herd, whatever "Adobe says" type of guy. DNG is actually the only RAW format that is open to all and to which any camera company or software program can, if they chose to, open, modify, save, and record.
Now, it may seem like I am splitting hairs or like I am on the Adobe bandwagon. I assure you I am not and struggled for a very long time as to whether I should bother with the DNG format. What really got my attention, and converted my thinking, was about 2 years ago when reading an interview with the renown photographer Frans Lanting. He indicated that even while still in the field (likely on an assignment for National Geographic), his workflow is to first copy his .NEF files to a hard drive and second to convert all of those .NEF files to DNG. I thought to myself "Wow, if he views it as that important as to perform this seemingly extra step, while still in the field, then maybe I should consider it too...."
That article got me thinking, 20+ years ago no one saw what a complete dominance of the medium digital photography would have today. Once "descent" digital cameras started coming out, I think we all saw that the future would be digital but no one predicted the shift would be so fast. So, as I sit here today, can I afford to assume that Nikon/Canon will continue to support the propritary files from my D100/10D forever? Can I afford to assume that other software vendors will continue to read the file format once Nikon/Canon discontinues this support? I could end up in the same boat I will be in now if my slide scanner breaks, only one or two vendors with quality products.
Anyway, that is my view on the matter. I, like Frans Lanting, keep both but only work from the DNG files because of the performance benefits. Well, that and to ensure that my original RAW file never gets corrupted or altered in any way but mostly, I do it for the DNG performance benefits.
Welcome to Lightroom. I hope you have a good experience!

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