I have reported the same problem as BBC, ITV, C4 etc players greyed out and not usable where I posted a workaround.
I have not been able to fix it, although I have not yet tried the "full retune" or "reset to default settings" as it will delete my schedule. 
I have had the channel logos in the Guide, Recording list, Schedule etc for the longest time this week - 4 days without the need to pull the plug to get them back.
After reading this post about deleting cookies, I thought 'I wonder...' and low and behold yesterday my logos disappeared, so I went and deleted the cookies and as if by magic they appeared!!!. Much easier than having to pull the plug!
This is an obvious bug and really does need fixing as without the logos it looks dreadful, but with them it looks great.
I have had the following response from Humax - as expected it is to do a reset.
Thank you for contacting Humax.
Please follow these instructions to perform factory default on a Freeview Play unit. Performing a factory default can help with picture/sound, signal and recording issues.
Please NOTE: System settings such as screen ratio will be reset and your schedule will be deleted but recorded programmes will be saved.
- Press Home/Freeview Play button on the remote
- Using the directional buttons move up (top right hand corner) and select Settings
- Select System Settings then Factory Default
- Choose Reset All Settings with the OK button
- Select ‘YES’
- Enter Password 0000
The unit will restart, please allow up to 2 minutes for this to happen
- Please select 'Start now' & choose your preferred language
- Select Next and allow the automatic search to reach 100%
- When the option SAVE becomes available, press OK
- Please choose your Internet Connection Method
- Select Next on confirmation Screen
- Select "I agree to the privacy policy" and press OK
- Select "I agree to the terms and conditions" and press OK
- Choose Next
- Next, select your "Power Saving In Standby" preference and press OK
- Then choose Exit
- Software check will take place
- Once finished scroll through the onscreen guide and press OK on the last screen
This completes the setup
Been there, done that... several times, it makes zero difference!
Harters - 11 minutes ago »
Been there, done that... several times, it makes zero difference!
You are cheering me up no end! You seem to be able to use the greyed out icons - I cannot select them
Another idea might be to re-install the software. I see I can download the latest release from https://uk.humaxdigital.com/support/?product_id=70&curr_page=sw_release
JohnH77 - 7 minutes ago »
Harters - 11 minutes ago »
Been there, done that... several times, it makes zero difference!You are cheering me up no end! You seem to be able to use the greyed out icons - I cannot select them
Another idea might be to re-install the software. I see I can download the latest release from https://uk.humaxdigital.com/support/?product_id=70&curr_page=sw_release
Apologies, I didn't mean to dishearten you, its that I am so frustrated with the 4000/5000. If you haven't done a factory reset yet, then maybe it will work for you. These boxes seem to be so temperamental, with some working better than others. Coming from a 100% reliable and problem free HDR-FOX t2, it really is a shock to the system... literally!
The link to the latest software is below
https://uk.humaxdigital.com/support/?product_id=70&curr_page=sw_release
Easiest thing to do first is to take a photo of your schedule, it makes it a lot easier to enter them after you have done a factory reset/new software install. You will not lose your recordings unless you chose the option to.
Good luck 
Compared to the "sluggish remote control" on the 9200T this box is perfect!!
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