The publishing/performing deadline/showdate has been missed. This can happen in any medium, but it happens a lot with webcomics.
Many webcomics are haphazardly written and posted, especially since the majority are written part-time as a hobby. Unless an author is careful to maintain a Strip Buffer, scheduling conflicts can result in strips being released late, be it hours, days, months or (in a few notorious cases) years.
Extreme cases of schedule slip may result in a Series Hiatus or even an Orphaned Series. Filler Strips are often used to cover for short (or even long) breaks in a series which is otherwise moving on schedule. On the bright side, this can help alleviate Archive Panic caused by date of first publication. The fact that so many webcomics adopted a "MWF Schedule" for their updates (meaning Monday-Wednesday-Friday) and then quickly fell into chronic slips led to the schedule being jokingly redubbed the "Maybe-Whenever-Forget it schedule."
Whether the lack of an obligation to make every deadline molds webcomics into a fundamentally different direction than commercial ones is left as an exercise for the reader. One reason Penny Arcade is still highly respected as a gamer comic is, among other things, avoiding delays after becoming a professional business.
As the non-webcomic examples of this phenomenon very much prove, even professional comic and manga creators are not immune from this, it's just more noticeable with webcomics due to the medium's properties. This also flows into Machinima and other works under the Web Original umbrella, as well as Fan Works.
Many times, the Schedule Slip is caused by a Creator Breakdown or something happening in real life. Often when this happens, the creator will mention that something has happened in real life that's prevented them from working on it. Compare Irregular Series, where the irregularity of releases is by design.
- Anime & Manga
- Comic Books
- Fan Works
- Live-Action TV
- Tabletop Games
- Video Games
- Web Original
- Western Animation
- Other Media
- Arenas: The Season Finale "REBELLION!" was going to be uploaded in May 1st. 2009. It ended up showing almost two months later.
- The Most Epic Story Ever Told in All of Human History: After posting episodes once or twice per month from May to October 2020, the twelfth episode wasn't released until March 2021, over five months later.
- Battle for Dream Island: Though it used to release on a monthly basis, the series began showing signs of Schedule Slip in its second season, Web Animation/Battle for Dream Island Again, as it deviated from this schedule. It then went on an unplanned hiatus after its fifth episode, lasting 1127 days before IDFB 1 was released, and exactly ten years and a whole other season starting and ending before the actual sixth episode of the season was released. A side-effect of this hiatus was that BFDI fans began watching other, smaller Object Shows, which helped grow the Object Show Community.
- Many of David Firth 's web series, including Salad Fingers, Burnt Face Man, Jerry Jackson, Sock, Not Stanley, The News Hasnít Happened Yet, and Panathinaikos Bear, saw new releases beginning in 2019 after having no episodes produced for several years prior.