Why are my new cards neither visible where the card count for a deck is displayed, now when I click onto the deck or go into ‘Browse’? I am having issues with all three decks I made yesterday, and have never had this issue before. Two of them are displaying some of the cards I made, whilst the first one I made is showing none. Would be grateful for help! They took me ages. 
Please check Deck Options > Daily Limits
On your computer, do any of the following to open deck options:
- Click the gear icon on the Decks screen.
- Select a deck on the Decks screen, and then click Options at the bottom of the screen.
- Click More > Options while in review mode.
- Press O while in review mode.
Maximum Reviews/Day
Allows you to set an upper limit on the number of review cards to show each day. When this limit is reached, Anki will not show any more review cards for the day, even if there are more waiting. If you study consistently, this setting can help to smooth out occasional peaks in due card counts, and can save you from a heart attack when returning to Anki after taking a week off. When reviews have been hidden due to this option, a message will appear in the congratulations screen, suggesting you consider increasing the limit if you have time.
Also check if your cards are not suspended
Browse > Cards mode
- If your cards are yellow then they are suspended
- If your cards are darker brown then they are buried
You can unsuspend or unbury by selecting > right click > suspend (crtl + J) / bury (crtl + shift + J)