Converted from an old (Beta) save to version 1.8
On entering the world only the skybox and clouds show but opening and closing the menu seems to resolve this.
However all my chests have completely disappeared meaning I only have the items in my inventory.
Also all nether portals become unlit.
Tried this with several different saves with the same results except in one there was also a problem with doors where only the bottom half of the door was visible and it could not be activated or destroyed.
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I mean OLD beta - as in from years ago, unfortunately I lost my later saves somewhere. But one of them was opened in 1.7.x with no problems and is now having issues.
Do you still have a backup of that one? Can you copy it and open it in 1.8 again and see if the problem is reproducible? You're probably going to have include a link to download the world save before anyone will be able to figure out what went wrong. It's probably also worth generating a forced crash report and attaching it here too.
If you have a backup of the world you can open in 1.7.x, you could try adding and removing an item in each chest to see if it 'rewrites' their NBT data into something 1.8 can deal with.
After converting the original beta world to 1.8:
Please attach the complete output of the "Game Output (Your Minecraft name) " which can be found on the fourth tab of the launcher.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".
Opening one of the saves again in 1.7.x resulted in the chests being present but all appearing to be oriented in the same direction. For double chests the texture was rotated but the blocks themselves weren't for activation or destruction (there was an invisible 'chest' block where the second should have been). Also my sitting dogs kept moving about but retaining the sitting position, and their collars weren't visible.
Destroying a chest (or half of a double chest) and replacing it seemed to overwrite the data and those appeared properly in 1.8, but simply adding or removing items didn't.
Maybe my saves got partially corrupted through some other manner but it seems odd that 3 different sets of backups from different times and saved in different places are behaving in the exact same manner.
Ok, so if things are messed up when opening in 1.7.x as well then we can say this is a bug that's been around for a while and not new to 1.8 at least.
If you have the time, make a bunch of copies of the pre-converted world (from backups) and try opening them with progressively older major versions (1.6.x, 1.5.x, 1.4.x, etc) and see how far back you have to go before it loads up correctly. That will probably help them narrow down what code changes were going on that started the problem. (It's probably worth trying 1.0 or 1.1 first though just to make sure it isn't a beta vs official thing).
When you say "beta", do you mean BETA beta from like three or four years ago, or one of the 1.8 pre-release snapshots from a month ago?
If you mean the former, 1.8 has a completely different method for handling world data (specifically tile entities). Worlds saved in 1.8 aren't even backwards compatible with 1.7.X. It's quite possible that the new code doesn't even understand a world save from that far back and may have corrupted something. If you have backups of the worlds frome before you opened them in 1.8, try instead opening them in several older versions in order up through 1.7.x before finally trying 1.8 again.
If you're instead referring to a pre-release snapshot, one or two of those had a major bug that corrupted tile entities. Again, restoring a 1.7.x world from backups and opening it in 1.8-release should be fine.